An information processing device (10) includes a gaze point calculation unit (51), a depth calculation unit (52), a display generation unit (53), and a drive calculation unit (55). The gaze point calculation unit (51) calculates a gaze point on a virtual image reflected on a half mirror (21). The depth calculation unit (52) generates depth information related to a depth of the gaze point. The display generation unit (53) generates a display object to be superimposed on the virtual image. The drive calculation unit (55) drives a superimposition optical system (30) of the display object so as to allow the display object to be observed as an image having a depth corresponding to the depth information.